Dozens of primary and high schools that have been isolated by the floodwaters will be closed today, and in some cases, also tomorrow.

The upriver town of Ulmarra, east of Grafton, is still isolated by flooding, as the Pacific Highway remains cut by floodwaters in the area.

But other roads have reopened and residents have been told they can return to parts of northern NSW.

The Pacific Highway is closed between Grafton and Ballina, but drivers can head via the Summerland Way to Casino and use the Bruxner Highway to bypass the area.

The manager of the New South Wales flood warning centre, Gordon McKay, says flood warnings remain in place for other parts of the state.

"We have a minor flood warning current for the Hunter," he said.

"For the Lower Richmond is a low-level major flooding (warning), and we're also looking at some floods in the Macintyre, Gwydir and Macleay Valleys.

"But I think given the size of this event, New South Wales got off relatively lightly compared to what is usually the case with ex-tropical cyclones in the state."

The Australian Bankers' Association says it will assist people affected by flooding across New South Wales.

Emergency relief packages will be offered to help families, business people and farmers.

Chief Executive of the Bankers Association, Steven Münchenberg says the support will be available from all banks.

"So whether you're with a major bank, a regional bank, some of the smaller banks, or international banks, they all have these sorts of packages available," he said.

"So if you are a bank customer and are worried about your finances, if you go to the Bankers Association website, there are numbers there for your bank to call so you can get through to the right person to help you."